from The Century Dictionary.
- noun In mineralogy, a kind of mica, allied to biotite, but characterized by the presence of a large amount of iron protoxid and the almost complete absence of magnesia: it is found near Pike's Peak in Colorado.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
rare silicate mineralof the micagroup.
from Wiktionary, Creative Commons Attribution/Share-Alike License
sidero- + phyllite
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